The Nuttall Encyclopedia
An earl of Arthurian legend, the father of Enid, who was ousted from his earldom by his nephew the "Sparrow-Hawk," but who, when overthrown, was compelled to restore it to him.
Wood, James, ed. Entry for 'Yniol'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/y/yniol.html. Frederick Warne & Co Ltd. London. 1900.